#define _CRT_SECURE_NO_WARNINGS
#pragma warning(disable:6031)

#include <stdio.h>

int main()
{
	int a = 0;
	int day = 1;

	scanf("%d", &a);

	while (a / 2 != 0)
	{
		a = a / 2;
		day++;
	}

	printf("%d", day);

	return 0;
}